Nd2Fe17 nanograins effect on the coercivity of HDDR NdFeB magnets with low boron content

Relationships between the coercivity of hydrogenation disproportionation desorption recombination （HDDR） Nd12.5Fe81.5-xfo6Bx bonded magnets and boron content were investigated. Nd2Fe17 phase with planar magnetic anisotropy is present in the microstructure when x= 4at%-5.88at%, which does not reduce...

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Veröffentlicht in:	International journal of minerals, metallurgy and materials metallurgy and materials, 2012-03, Vol.19 (3), p.236-239
Hauptverfasser:	Sun, Ai-zhi, Wu, Shen, Xu, Wen-huan, Wang, Jin, Zhang, Qian, Zhai, Fu-qiang, Volinsky, Alex A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Anisotropy Bonding Boron Ceramics Characterization and Evaluation of Materials Chemistry and Materials Science Coercive force Coercivity Composites Corrosion and Coatings Disproportionation Glass HDDR High resolution electron microscopy Magnetic anisotropy Magnets Materials Science Metallic Materials Metallurgy Nanostructure Natural Materials Permanent magnets Surfaces and Interfaces Thin Films Tribology 交换耦合相互作用矫顽力硼含量粘结磁体纳米晶体钕铁硼磁体高分辨透射电子显微镜
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Zusammenfassung:	Relationships between the coercivity of hydrogenation disproportionation desorption recombination （HDDR） Nd12.5Fe81.5-xfo6Bx bonded magnets and boron content were investigated. Nd2Fe17 phase with planar magnetic anisotropy is present in the microstructure when x= 4at%-5.88at%, which does not reduce the coercivity of the bonded magnets. High-resolution transmission electron microscopy （TEM） images show that Nd2Fe17 phase exists in the form of nanocrystals in the Nd2Fe14B matrix. There is an exchange-coupling interaction between the two phases so that the coercivity of HDDR Nd12.5Fe81.5-xCo6Bx bonded magnets is hardly reduced with a decrease in boron content.
ISSN:	1674-4799 1869-103X
DOI:	10.1007/s12613-012-0544-z